钢板桩支护有哪些特点?
参考答案:板桩材料质量可靠,在软弱土层中施工速度快,施工也较简单,并具有较好的挡水性,临时性结构的钢板桩可拔出多次重复使用,降低成本。
. –Hi, Mary. Would you like to go to the concert this evening?
--Sorry, Tom. Tomorrow’s lessons, I have no time to go out with you.
A.Not preparing
B.Not having prepared
C.Not to prepare
D.Being not prepared
地西泮抗焦虑作用的主要部位是
A.网状结构上行激动系统
B.大脑皮层
C.黑质纹状体多巴胺通路
D.边缘系统
E.下丘脑